JP2006071942A - Lens frame driving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simply constituted lens frame driving apparatus where a manual operation and a motor-driven operation for moving a moving lens backward and forward can be performed. <P>SOLUTION: Regarding a mirror frame apparatus 1 incorporating the lens frame driving apparatus, the apparatus 1 is provided with an ultrasonic actuator 30 attached to a fixed frame 2 through a mounting plate 11, and a moving frame 4 with which the oscillator 35 of the ultrasonic actuator 30 comes in press contact is fitted into the outer circumferential part of the fixed frame 2 so that the frame 4 can move backward and forward. Further, a follower frame 6 is fitted to the outer circumferential part of the moving frame 4, and an outer frame 5 is fitted to the outer circumferential part of the follower frame 6 so that the frame 6 and the frame 5 can move backward and forward. A roller 7 is assembled with the follower frame 6 in a state where the moving frame 4 and the outer frame 5 come in press contact with each other, and when the moving frame 4 is electrically driven by the actuator 30, the follower frame 6 is driven backward and forward through the roller 7 in accordance with the backward and forward movement of the frame 4, on the other hand, when the outer frame 5 is driven backward and forward with the manual operation, the follower frame 6 is driven backward and forward through the roller 7 in accordance with the backward and forward movement of the outer frame 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lens barrel driving device having a driving source using a vibrator.

Conventionally, an ultrasonic vibrator motor is applied as a driving source for lens advance / retreat driving, and there is a lens barrel disclosed in Patent Document 1 that can be manually operated and electrically driven. This lens barrel incorporates an annular rotary vibration motor, and an annular manual ring for performing a manual focusing operation is provided on the outer periphery of the lens barrel. The manual ring is connected via a planetary mechanism to the output end of a vibration type motor for performing autofocus at the inner periphery thereof. In this lens barrel, focusing by manual focus driving and autofocus driving of the lens is possible via the planetary mechanism.
Japanese Patent Application Laid-Open No. 9-318861 is disclosed in Japanese Patent Laid-Open No. 9-318861.

  Patent Document 1 describes a rotationally driven lens barrel to which a rotational vibration motor is applied as described above. In such a rotationally driven lens barrel, the lens frame is advanced and retracted. A conversion mechanism is required, and the lens barrel structure is inevitably complicated. This Patent Document 1 does not describe a lens barrel that directly drives a lens by applying a linear vibration motor.

  The present invention has been made in view of the above-described situation, and an object thereof is to provide a lens barrel driving device capable of manual operation and electric driving for moving lens advancement and retraction having a simple configuration. To do.

  The lens barrel driving device according to claim 1 of the present invention is subjected to the action of elliptical vibration of at least one vibrator that generates elliptical vibration by combining bending standing wave vibration and longitudinal vibration, An electric drive member that is driven to move straight along the optical axis direction relative to the vibrator; a manual drive member that is movable along the optical axis direction according to a manual operation; and A rolling element is provided in pressure contact with the outer surface of the electric drive member and the inner surface of the manual drive member, and is capable of rolling along the optical axis direction. The electric drive member and the manual drive member And a driven member that moves linearly along the optical axis direction together with the rolling elements that move while rotating in response to the movement along the relative optical axis direction.

  A lens barrel driving device according to a second aspect of the present invention is the lens barrel driving device according to the first aspect, wherein the vibrator is provided so as to be in press contact with the inner surface of the electric driving member. It has been.

  A lens barrel driving device according to a third aspect of the present invention is the lens barrel driving device according to the first aspect, wherein the rolling element has a rotation axis parallel to a plane perpendicular to the optical axis. It is arranged to be in the direction.

  A lens barrel driving device according to a fourth aspect of the present invention is the lens barrel driving device according to the first aspect, further comprising an inner portion of the driven member so that the rolling element is exposed to the inner surface and the outer surface. The rolling element is formed so as to be integrally movable along the optical axis direction with the driven member through the window formed through the outer surface, and to be rotatable relative to the driven member. Supporting means for supporting.

  A lens barrel driving apparatus according to a fifth aspect of the present invention is the lens barrel driving apparatus according to the first aspect, wherein the vibrator is rotatable about an axis substantially perpendicular to the optical axis. The shaft is supported and arranged.

  A lens barrel driving device according to a sixth aspect of the present invention is the lens barrel driving device according to the fifth aspect, wherein the vibrator is always in contact with the electric drive member with respect to the optical axis. There is a biasing means for pressing and biasing in a substantially vertical direction.

  A lens barrel driving device according to a seventh aspect of the present invention is the lens barrel driving device according to the first aspect, further comprising a manually operated manual rotation operation member and a rotation operation of the manual rotation operation member. And a drive conversion mechanism that converts the manual drive member so as to move straight along the optical axis direction.

  A lens barrel driving apparatus according to an eighth aspect of the present invention is the lens barrel driving apparatus according to the first aspect, wherein the moving lens is driven by a straight movement of the driven member to be driven.

  The lens barrel drive device according to claim 9 of the present invention is the lens barrel drive device according to claim 1, wherein the electric drive member, the manual drive member, and the driven member are in an optical axis direction. It is an annular member supported so that only the rectilinear movement along is possible.

  According to the present invention, it is possible to provide a lens barrel driving device having a simple configuration in a lens barrel driving device capable of manual operation for moving the moving lens back and forth and electric driving.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of a lens barrel device incorporating a lens barrel driving device according to a first embodiment of the present invention. FIG. 2 is a perspective view showing a state in which an ultrasonic actuator is mounted on the fixed frame of the lens barrel device. FIG. 3 is a perspective view showing a state in which the moving frame is inserted into the fixed frame in a state where the ultrasonic actuator of the lens barrel device is mounted. FIG. 4 is a perspective view showing a state in which a driving roller is inserted into the driven frame of the lens barrel device. FIG. 5 is a perspective view (partially shown in cross section) of the lens barrel device, showing an initial driving state. FIG. 6 is a perspective view showing a partial cross section of the lens barrel device, and shows a driving state by the moving frame. FIG. 7 is a perspective view showing a partial cross section of the lens barrel device, and shows a driving state by the outer frame. FIG. 8 is a partial cross-sectional view of the lens barrel device and shows a state corresponding to FIG. FIG. 9 is a partial sectional view of the lens barrel device and shows a state corresponding to FIG. FIG. 10 is a partial sectional view of the lens barrel device and shows a state corresponding to FIG. However, in FIGS. 5 to 7, a lens holding frame 9 and a taking lens 10 described later shown in FIG. 1 are omitted in order to avoid complicated drawings.

  The lens frame device 1 of the present embodiment is a lens frame device capable of electric focus drive and manual focus operation. As shown in FIGS. 1 and 5, a fixed frame 2 that is a fixed member, and an outer periphery of the fixed frame 2. The support frame 3 that is inserted and fixed, the moving frame 4 that is an electric drive member, the outer frame 5 that is a manual drive member, the driven frame 6 that is a driven member, and the driven frame 6 are fixed. A lens holding frame 9 that holds a photographic lens 10 that is a moving lens, an ultrasonic actuator 30 that is attached to the fixed frame 2 via an actuator support plate 11 that is a biasing means, and an annular portion of the driven frame 6 And a roller 7 as a rolling element supported in the upper penetrating hole. In the following description, the optical axis of the photographing lens is O, the direction along the optical axis O is the Oz direction, the subject side is the + Oz side, and the imaging side is the -Oz side. The radial direction with respect to the optical axis O is defined as the R direction, and the outer peripheral tangential direction around the optical axis O is defined as the T direction.

  The fixed frame 2 is an annular frame member that is fixedly supported by the camera body and the like, and is provided with a guide pin 2a fixed to the lower part of the outer peripheral part, and for attaching an ultrasonic motor part above the annular part. An opening 2b is provided.

  The support frame 3 is a stepped ring-shaped frame member that is fitted and fixed to the rear outer peripheral portion of the fixed frame 2, and the friction lubrication sheet member 8 is attached to the front inner peripheral portion, The outer frame 5 is slidably fitted into the inner peripheral portion of the frictional lubrication sheet member 8.

  The moving frame 4 is an annular frame member that fits in the outer peripheral portion of the fixed frame 2 and can move linearly in the Oz direction. The moving frame 4 has a linear guide groove 4a in the Oz direction on the inner peripheral portion of the moving frame 4 and Oz above the outer peripheral portion. Direction roller guide groove 4b. In a state where the moving frame 4 is fitted on the outer periphery of the fixed frame 2, the guide pin 2 a of the fixed frame 2 is fitted in the rectilinear guide groove 4 a, and the moving frame 4 is in a state of being guided linearly with respect to the fixed frame 2.

  The driven frame 6 is an annular frame member that is fitted in the outer peripheral portion of the moving frame 4 and can move linearly in the Oz direction, and a lens holding frame 9 that holds the photographing lens 10 is fixed to a front portion thereof. Further, a roller insertion hole 6a serving as a window portion of an opening penetrating the inner and outer periphery is provided above the annular portion (FIG. 5). At both ends in the T direction of the roller insertion hole 6a, V-shaped or U-shaped shaft support grooves 6b serving as support means for supporting a shaft portion 7a of the roller 7 described later are provided (FIG. 4).

  The outer frame 5 is an annular frame member that can move linearly in the Oz direction. The outer frame 5 is fitted into the outer peripheral portion of the driven frame 6 and the inner peripheral portion of the frictional lubrication sheet member 8 in the fixed frame 2 side support frame 3. Fit into. A roller guide groove 5b in the Oz direction is provided at the upper part of the inner peripheral portion of the outer frame 5. A frictional force due to the sheet member 8 exists between the outer frame 5 and the frictional lubrication sheet member 8, and the outer frame 5 is held in a state of receiving a movement resistance force with respect to the fixed frame 2.

  The roller 7 is a roller member having a penetrating shaft portion 7a, and has an outer peripheral surface that is in contact with the roller guide groove contact surface in a high friction coefficient state. The roller 7 is inserted into the roller insertion hole 6a of the driven frame 6, the shaft portion 7a is fitted into the shaft support groove 6b, and is attached in a state parallel to a plane perpendicular to the optical axis O. Accordingly, the roller 7 is rotatable with respect to the driven frame 6 and supported so as to move integrally in the Oz direction.

  Then, the driven frame 6 is inserted into the outer periphery of the moving frame 4 as shown in FIG. In a state in which the outer frame 5 is fitted on the outer periphery of the driven frame 6, the roller 7 is fitted into the roller guide groove 4 b of the moving frame 4 and the roller guide groove 5 b of the outer frame 5 and comes into contact therewith. Since the width of the roller 7 and the width of the roller guide grooves 4 b and 5 b are the same, the movement frame 4 and the outer frame 5 are restricted in rotation with respect to the driven frame 6.

  In the fitted state, the outer periphery of the roller 7 is held in a state of being held in contact with the sliding surfaces of the roller guide grooves 4b and 5b with a predetermined urging force. When the moving frame 4 or the outer frame 5 moves relative to each other in the Oz direction, the roller 7 rolls with little slip between the outer periphery and the sliding surfaces of the roller guide grooves 4b and 5b. The frame 6 moves in the same direction as the relative movement direction of the moving frame 4 or the outer frame 5 by an amount of about ½. In other words, the roller 7 and the driven frame 6 constitute a drive conversion mechanism in which the driven frame 6 is differentially driven in the Oz direction with respect to the moving frame 4 or the outer frame 5.

  The ultrasonic actuator 30 is a linear ultrasonic actuator, and includes a vibrator 35 and a flexible printed circuit board (FPC) 42 as a connection board as shown in FIG. The vibrator 35 includes a laminated piezoelectric plate 35A (FIG. 16), and further includes a support shaft (pin) 36 that passes through the laminated piezoelectric plate 35A and is fixedly disposed at a vibration node, and an upper surface of the vibrator 35 (see FIG. 16). 1) A pair of driving elements 39 fixed in the upper direction perpendicular to the support shaft direction is provided on the abdomen of the side elliptical vibration.

  The contact surface of the driver 39 is an arc-shaped convex surface, and its curvature is the same as the curvature of the inner peripheral surface of the moving frame 4. However, the contact surface of the drive element 39 is not an arc shape but a flat surface, and a portion of the inner peripheral surface of the moving frame 4 that is in contact with the drive element 39 is formed in a flat surface so that a uniform contact state is obtained. It is also possible to keep it.

  When an ultrasonic driving voltage is applied to the vibrator 35, the longitudinal bending vibration is excited, and the driver 39 performs elliptical vibration. The detailed configuration of the ultrasonic actuator 30 will be described later.

  The actuator support plate 11 is a member formed of a metal plate, extends obliquely upward, and has four arm portions 11b that can be elastically deformed in the R direction, and screw insertion holes 11a that are arranged at the distal end portion of the arm portion 11b. And two upright portions 11c arranged opposite to each other in the T direction at the central portion, and a notch portion 11d for supporting the support shaft 36 of the actuator arranged at the front end of the upright portion. Yes.

  The actuator support plate 11 holds the vibrator 35 in a mounted state in which the support shaft 36 is fitted in the notch 11d, and the screw 12 is inserted through the screw insertion hole 11a to be inserted into the screw hole 2c from the inner peripheral side of the fixed frame 2. Are attached to the inner peripheral side of the opening 2b of the fixed frame 2 (FIG. 2). In the attached state, the vibrator 35 is rotatably supported by a support shaft 36 in the T direction perpendicular to the optical axis O. The vibrator 35 is urged by the four arm portions 11 b in the R direction (toward the outer peripheral side) in a direction substantially perpendicular to the optical axis O, and the driver 39 is placed on the inner peripheral surface of the moving frame 4. Always abut.

Here, details of the ultrasonic actuator 30 will be described with reference to FIGS.
FIG. 11 is a view of the state in which the flexible printed board is fixed to the vibrator of the ultrasonic actuator as seen from the support axis direction. 12 is a view taken in the direction of arrow A in FIG. FIG. 13 is a view of the state in which the flexible printed board is removed from the vibrator of FIG. 11 as viewed from the support axis direction. 14 is a view taken in the direction of arrow B in FIG. FIG. 15 is a view taken in the direction of arrow C in FIG. FIG. 16 is an exploded perspective view of the piezoelectric element portion and the insulating plate constituting the vibrator before baking. FIG. 17 is an enlarged view showing a deformed state of the vibrator when combined with bending vibration and longitudinal vibration. The vibrator is changed from the bent state of FIG. It shows a state of deformation in the order of the extended state, the bent state of FIG. 17C, and the contracted state of FIG. FIG. 18 is a block configuration diagram of a drive control circuit for driving the vibrator. In addition, the Oz, R, and T directions in the figure indicate the directions when the lens barrel device is attached.

  The vibrator 35 constituting the ultrasonic actuator 30 includes a laminated piezoelectric body 35A composed of a plurality of two types of piezoelectric sheets 37X and 37Y and two insulating plates 37A and 37B, as shown in FIGS. Electrodes 41a, 41b, 41c, 41d, 41a ', 41b' made of a conductive silver paste, and the above-described support shaft 36 and a pair of driver elements 39 are attached.

  The two types of piezoelectric sheets 37X and 37Y are each composed of a rectangular piezoelectric element having a thickness of about 100 μm. In the piezoelectric sheet 37X, first internal electrodes 37Xa, 37Xc, 37Xc ′, 37Xa ′, which are coated with a silver-palladium alloy having a thickness of about 10 μm on the front surface, are divided into four insulated regions. . The upper end portion of each internal electrode extends to the end face position in the longitudinal direction (Oz direction) of the piezoelectric element (FIG. 16).

  On the other hand, the second internal electrodes 37Yb, 37Yd, 37Yd ', 37Yb', whose front surface is coated with a silver-palladium alloy having a thickness of about 10 μm, are divided into four insulated regions and disposed on the piezoelectric sheet 37Y. ing. The lower end of the internal electrode extends to the end face position in the longitudinal direction (Oz direction) of the piezoelectric element (FIG. 16).

  The first internal electrodes 37Xa, 37Xc, 37Xc ', 37Xa' of the piezoelectric sheets 37X, 37Y adjacent to each other and the second internal electrodes 37Yb, 37Yd, 37Yd ', 37Yb' have the same shape, and the end portions of the electrodes are up and down. Are reversed, and the rectangular electrode surfaces are arranged so as to overlap each other when stacked. About 40 layers of two types of piezoelectric sheets 37X and 37Y provided with such internal electrodes are alternately laminated.

  As shown in FIG. 16, on the left end face of the stacked piezoelectric elements, there are formed internal electrode exposing portions where the end portions of the first internal electrodes 37Xa and 37Xc and the second internal electrodes 37Yb and 37Yd are exposed in a stacked state. (Not shown). On the right end surface of the laminated piezoelectric element, an internal electrode exposing portion is formed in which the end portions of the first internal electrodes 37Xc ′ and 37Xa ′ and the second internal electrodes 37Yd ′ and 37Yb ′ are exposed on the end surfaces in the laminated state ( Not shown). Further, four independent external electrodes each made of a conductive silver paste are formed on both side surfaces on the internal electrode exposed portion, and are electrically connected to the internal electrodes (FIG. 14).

  Insulating plates 37A and 37B having the same rectangular shape as the piezoelectric sheets 37X and 37Y are arranged on the front and rear surfaces of the laminated piezoelectric elements, thereby forming a laminated piezoelectric body 35A. As shown in FIG. 13, electrodes 41a, 41b, 41c, 41d, 41a ', 41b' made of conductive silver paste are formed on the surface of the front insulating plate 37A.

  The electrodes 41a, 41b, 41c, 41d, 41a ', 41b' on the insulating plate 37A are electrically connected to the internal electrodes on both side surfaces in the laminated state exposed on both sides of each laminated piezoelectric sheet. That is, the first internal electrode 37Xa is electrically connected to the electrode 41a. The electrode 41b is electrically connected to the second internal electrode 37Yb. A first internal electrode 37Xc and a first internal electrode 37Xc ′ are electrically connected to the electrode 41c. A second internal electrode 37Yd and a second internal electrode 37Yd 'are electrically connected to the electrode 41d. The first internal electrode 37Xa ′ is electrically connected to the electrode 41a ′. A second internal electrode 37Yb 'is electrically connected to the electrode 41b'.

  When the laminated piezoelectric body 35A in which the insulating plates 37A and 37B are superimposed on the laminated piezoelectric sheets 37X and 37Y in the electrode connected state is baked and polarized using the electrodes, the vibrator 35 is obtained.

  A pair of driver elements 39 are adhered and fixed to the antinode position of the vibration in the longitudinal direction (Oz direction) on the end surface in the direction (R direction) orthogonal to the stacking direction of the vibrators 35. The driver 39 is formed by dispersing alumina in a polymer material.

  Further, a through hole is formed in the stacking direction (T direction) at a substantially central portion of the vibrator 35, that is, a position serving as a node that is a vibration neutral point of the vibrator. A support shaft 36 made of, for example, penetrates and is fixed by adhesion (FIG. 14).

  On each electrode 41a, 41b, 41c, 41d, 41a ', 41b' provided on the insulating plate 37A of the vibrator 35, an FPC 42, which is a connection board having a connection pattern, is mounted in a state of being electrically connected to each electrode. (FIG. 11).

  Specifically, the connection FPC 42 has a connection pattern of signal lines 42a, 42b, 42c and 42d as shown in FIG. 11, and the signal lines 42a (A1 + side) have electrodes 41a and 41a ′ on the insulating plate 37A. Are connected together. The electrodes 41b and 41b 'of the insulating plate 37A are connected together to the signal line 42b (A1-side). The electrode 41c of the insulating plate 37A is connected to the signal line 42c (A2 + side). The electrode 41d of the insulating plate 37A is connected to the signal line 42d (A2-side). The signal lines 42a, 42b, 42c, and 42d are connected to a vibrator driving circuit 24 described later.

  The vibrator driving circuit 24 includes an oscillating unit 45, a phase shifting unit 46, a driving unit 47, and the like, and a driving voltage (frequency signal) phase-controlled via the driving unit 47 oscillates as will be described later. Applied to the child 35.

  The vibrator 35 to which the drive voltage is applied generates a vibration in which the bending standing wave vibration and the longitudinal vibration shown in FIGS. 17A, 17B, 17C, and 17D are combined. Ellipse vibrations (ellipse vibrations of the trajectories E1 and E2 shown in FIG. 11) are generated at the tip of each. Since the moving frame 4 is pressed against the contact surface of the driver 39, the moving frame 4 relatively moves in the Oz direction by the elliptical vibration.

Next, the operation of the vibrator 35 of the ultrasonic actuator 30 will be described in detail with reference to FIGS.
The transducer 35 of the ultrasonic actuator 30 includes a control signal from a control unit of a body control microcomputer 50 (hereinafter referred to as Bμcom) 50 in FIG. Control is performed based on detection signals from a phase difference detection unit 48 and a current detection unit 49 which are vibration information detection units of a lens control microcomputer (hereinafter referred to as Lμcom) 20 incorporated in the lens frame device 1 side. 18 is driven by a vibrator driving circuit 24 including an oscillating unit 45, a phase shift unit 46, and a driving unit 47.

  In the drive circuit of FIG. 18, the signal from the oscillating unit 45 is the same signal on one signal line 42a, 42b (A1 +, −) and the phase shift on the other signal line 42c, 42d (A2 +, −). A signal whose phase is changed by 90 ° by the unit 46 is input to the drive unit 47.

  That is, in one of the signal inputs that do not pass through the phase shift unit 46, a signal that has been voltage amplified with the same phase is output to the signal line 42a of the connection FPC 42 as the first signal (A1 +). The other is that the output is inverted from the first output (negative voltage), that is, the phase-shifted output is 180 ° and the voltage amplified output is output to the signal line 42b as the second signal (A1-). Is done.

  On the other hand, among the signal inputs whose phase is changed by 90 ° through the phase shifter 46, one of them is a signal whose voltage is amplified with the same phase as it is, and is output to the signal line 42c as the third signal (A2 +). One is the output inverted from the third signal (negative voltage), that is, the output amplified by shifting the phase by 180 ° is output to the signal line 42d as the fourth signal (A2-).

  By inputting the first to fourth signals described above to the vibrator 35, the vibrator 35 generates a vibration in which bending vibration and longitudinal vibration are combined (FIGS. 17A to 17D). Elliptical vibrations (indicated by the trajectories E1 and E2 in FIG. 11) are generated at the tip. Since the moving frame 4 as a driven body is pressed to the tip of the driving element 39 of the vibrator 35, the relative driving force in the Oz direction along the rotational direction of the elliptical vibration is transmitted through the driving element 39 to the moving frame 4. Given to.

  The direction of the driving force applied to the moving frame 4 is determined by the rotational direction of the elliptical vibration of the driver 39, but the rotational direction of the elliptical vibration is set by a phase shift at the phase shift unit 46.

  The drive signal line of the vibrator 35 is connected to a current detection unit 49 in the Lμcom 20 that detects the current of the frequency signal applied to the vibrator, which is a parameter representing the vibration state. Further, the current detector 49 is connected to a phase difference detector 48 in the Lμcom 20 that detects the phase difference between the voltage of the frequency signal from the oscillator 45 and the current detected by the current detector 49. The phase difference detection unit 48 is connected to a control unit in the Bμcom 50 in order to capture a phase difference signal between the detected current and voltage. An oscillation unit 45 is connected to the control unit.

  The phase difference between the current and voltage, which is a parameter of the vibration state of the vibrator 35, is detected by the phase difference detection unit 48, and the control unit utilizes the phase difference between the detected current and voltage according to the external environment. A frequency in the vicinity of the resonance frequency of the vibrator 35 whose vibration state has changed can be detected. Further, the detected frequency near the resonance frequency is fed back to the oscillation unit 45.

  In the present embodiment, the drive signal applied to the vibrator 35 is a frequency signal, but may be a rectangular wave, a sine wave signal, or a sawtooth signal. In the case of this embodiment, the phase difference detected by the phase difference detection unit 48 is the phase difference between the voltage of the frequency signal of the oscillation unit 45 and the current of the frequency signal applied to the vibrator. The phase difference between the voltage and current of the frequency signal applied to the vibrator is not limited.

  As described above, in the ultrasonic actuator 30 according to the present embodiment, the phase difference between the current of the frequency signal applied to the transducer 35 detected by the phase difference detection unit 48 and the voltage of the frequency signal from the oscillation unit 45 is expressed by the Bμcom50. The frequency near the resonance frequency of the vibrator 35 at the time when the frequency detection operation is performed is detected. By feeding back the result to the oscillating unit 45, even when the resonance state of the vibrator 35 changes due to a change in external factors, a frequency near the resonance frequency can be detected and driven at that frequency. The effect that the vibrator 35 can be driven in a good state is obtained.

  In the lens barrel device 1 having the above-described configuration, the moving frame 4 is fitted into the outer peripheral portion of the fixed frame 2 on which the ultrasonic actuator 30 is mounted via the actuator support plate 11, and the guide pins 2 a of the fixed frame 2 are inserted. It is slidably fitted into the straight guide groove 4a of the moving frame 4 (FIG. 3). Accordingly, the moving frame 4 is restricted from rotating with respect to the fixed frame 2 and is supported so as to be able to advance and retreat. In the attached state, the driver 39 of the vibrator 35 contacts the inner peripheral portion of the moving frame 4 with a predetermined contact pressure. The contact pressure is obtained by elastic deformation of the arm portion 11 b of the actuator support plate 11.

  Further, the driven frame 6 is inserted into the outer peripheral portion of the moving frame 4, and the outer frame 5 is inserted into the outer peripheral portion of the driven frame 6. The outer peripheral portion of the outer frame 5 is fitted into the inner periphery of the friction lubrication sheet member 8 disposed inside the support frame 3 fixed to the fixed frame 2 (FIG. 5). In the inserted state, the roller 7 is inserted into the roller insertion hole 6a of the driven frame 6 and is rotatably supported. The outer peripheral portion of the roller 7 is fitted into roller guide grooves 4b and 5b between the moving frame 4 and the outer frame 5, and is held and held in the radial direction by a predetermined contact pressure.

  Here, the advancing / retreating operation of the lens frame device 1 will be described. Now, assuming that the lens frame device 1 is in the initial state (retraction state) shown in FIGS. When the above-mentioned frequency signal is applied to the vibrator 35, the driver 39 is elliptically vibrated in the direction shown in FIG. A driving force in the + Oz direction acts on the moving frame 4 that is in pressure contact with the driver 39, and is fed out in the same direction. If the outer frame 5 is held at a fixed position by the support frame 3, the roller 7 moves in the + Oz direction while rolling between the outer frame 5 and the moving frame 4 as the moving frame 4 is extended, 6 and 9, the driven frame 6 is fed out together with the roller 7. The lens holding frame 9 is also fed out integrally, and electric focusing is performed.

  On the other hand, when the lens frame device 1 is in the initial state (retracted state) shown in FIGS. 5 and 8, when the outer frame 5 is manually extended in the + Oz direction in order to perform the manual focus operation, the moving frame 4 is moved to the inner surface side. The roller 7 moves in the + Oz direction while rolling between the outer frame 5 and the moving frame 4 and is driven as shown in FIGS. The frame 6 is fed out together with the roller 7. The lens holding frame 9 is also unwound and manual focusing is performed.

  In addition, the electric drive or the manual focus drive for retracting the lens holding frame 9 in the -Oz direction can be performed by an operation reverse to the above-described operation.

  According to the lens barrel device 1 of the present embodiment described above, by directly incorporating the roller 7 into the driven frame 6 for the forward / backward driving by electric drive and the forward / backward driving by manual operation, the direct forward / backward driving is performed without converting the straight driving to the rotational operation. The lens frame device can be made compact and downsized.

  The fixed frame 2, the moving frame 4, the outer frame 5, etc. that constitute the lens barrel device 1 are not limited to the above-described ring-shaped frame members because they are not rotationally driven. Even if it is a member, the gist of the present invention can be applied.

  In the present embodiment, the lens frame device 1 has been described as being capable of electric focus driving and manual focus operation. However, the lens frame device 1 can also be applied to a lens frame device capable of electric and manual zooming with the same configuration. It is.

Next, a lens barrel device according to a second embodiment of the present invention will be described with reference to FIGS.
The lens frame device of the second embodiment is a lens frame device capable of electric focus drive and manual focus operation as in the first embodiment, but the outer frame for manual focus operation can be rotated. It has become. Other configurations are the same as those of the first embodiment, and the same components are denoted by the same reference numerals, and different portions will be mainly described below.

  FIG. 19 is an exploded perspective view of a lens barrel device incorporating a lens barrel driving device according to the present embodiment. FIG. 20 is a perspective view (partially shown in cross section) of the lens barrel device, showing an initial driving state. FIG. 21 is a perspective view showing a partial cross section of the lens barrel device, and shows a driving state by the moving frame. FIG. 22 is a perspective view showing a partial cross section of the lens barrel device, and shows a driving state by the outer frame. FIG. 23 is a partial sectional view of the lens barrel device and shows a state corresponding to FIG. FIG. 24 is a partial sectional view of the lens barrel device and shows a state corresponding to FIG. FIG. 25 is a partial sectional view of the lens barrel device and shows a state corresponding to FIG. However, in FIGS. 20 to 22, a lens holding frame 9 and a taking lens 10 described later shown in FIG. 19 are omitted in order to avoid complicated drawings.

  The lens frame device 51 of the present embodiment is also a lens frame device capable of electric focus drive and manual focus operation. As shown in FIGS. 19 and 20, the fixed frame 2 as a fixing member and the outer periphery of the fixed frame 2 are fitted. The support frame 53 that is fixed in this manner, the moving frame 4 that is an electric drive member, the rotation operation frame 57 that is a manual drive member (manual rotation operation member), the outer frame 55, and the driven member. A driven frame 6, a lens holding frame 9 to which the driven frame 6 is fixed and holding a photographing lens 10 that is a moving lens, and an ultrasonic actuator 30 that is attached to the fixed frame 2 via an actuator support plate 11. And a roller 7 as a rolling element supported in a through-hole portion on the annular portion of the driven frame 6.

  Unlike the lens frame device 1 of the first embodiment, the above-described support frame 53, rotation operation frame 57, and outer frame 55 are the constituent members of the lens frame device 51, and the other components are configured by the same members. The

  The support frame 53 is a stepped ring-shaped frame member that is fitted and fixed to the rear outer peripheral portion of the fixed frame 2, and is provided with an engaging portion 53 c for connection with the rotation operation frame 57 along the inner periphery of the distal end portion. It is done.

  The outer frame 55 is an annular frame member that is fitted in the outer peripheral portion of the driven frame 6 and can move linearly in the Oz direction. An Oz-direction roller guide groove 55b is provided on the inner peripheral portion of the outer frame 55, and The outer peripheral portion is provided with a pin 55a that is screwed into the screw hole 55c.

  The rotation operation frame 57 is a ring-shaped frame member that can be rotated, and has a rear end portion that engages with the engagement portion 53c of the support frame 53 on the rotation operation frame side. A portion 57c is provided, and an inclined guide groove 57a that is inclined with respect to the Oz direction is provided in the annular portion.

  The outer frame 55 described above is slidably fitted into the outer peripheral portion of the driven frame 6 in which the fixed frame 2, the ultrasonic actuator 30, the moving frame 4, and the like are incorporated in the inner peripheral portion thereof. Then, the roller 7 is fitted into the roller guide groove 55 b of the outer frame 55. Further, the rotation operation frame 57 is rotatably fitted to the outer peripheral portion of the outer frame 55, and the engagement portion 57 c at the rear end is engaged with the engagement portion 53 c for connection of the support frame 53. Further, the pin 55 a is fitted into the skew guide groove 57 a and screwed to the outer periphery of the outer frame 55.

  The advancing / retreating operation of the lens barrel device 51 having the above-described configuration will now be described. Now, when the lens barrel device 51 is in the initial state (retracted state) shown in FIGS. When the above-described frequency signal is applied to 30 vibrators 35, the driver 39 is elliptically vibrated in the direction shown in FIG. As in the case of the first embodiment, a driving force in the + Oz direction acts on the moving frame 4 that is in pressure contact with the driving element 39 and is fed out in the same direction. At that time, since the pin 55a is fitted in the skew guide groove 57a of the rotation operation frame 57, the outer frame 55 is held at a fixed position due to its frictional resistance. Accordingly, the roller 7 moves in the + Oz direction while rolling between the outer frame 55 and the moving frame 4 as the moving frame 4 is extended, and the driven frame 6 together with the roller 7 moves as shown in FIGS. It is paid out. The lens holding frame 9 is also fed out integrally, and electric focusing is performed.

  On the other hand, when the lens frame device 51 is in the initial state (retracted state) shown in FIGS. 20 and 23, the manual operation for manual focus is performed so that the rotation operation frame 57 is manually operated in the + D direction (counterclockwise when viewed from the subject side). When the pivoting operation is performed by, the outer frame 55 is fed out in the + Oz direction by the skew guide groove 57a. Since the moving frame 4 is held at a fixed position by the driver 39 that is in contact with the inner surface side, the roller 7 rolls between the outer frame 55 and the moving frame 4 by the above-described movement of the outer frame 55. While moving in the + Oz direction. Then, as shown in FIGS. 22 and 25, the driven frame 6 is fed out together with the roller 7. The lens holding frame 9 is also unwound and manual focusing is performed.

  In addition, the electric drive or the manual focus drive for retracting the lens holding frame 9 in the -Oz direction can be performed by an operation reverse to the above-described operation.

  According to the lens frame device 51 of the present embodiment described above, the same effects as in the case of the first embodiment described above can be obtained. In particular, since the rotation operation frame 57 for manual focus operation is provided on the outer peripheral portion, the manual operation is performed manually. An easy-to-use lens frame device that is easy to focus on can be realized.

  The lens barrel driving device according to the present invention can be used as a lens barrel driving device having a simple configuration in a lens barrel driving device capable of manual operation and electric driving for advancing and retracting the photographing lens.

1 is an exploded perspective view of a lens barrel device incorporating a lens barrel driving mechanism according to a first embodiment of the present invention. It is a perspective view which shows the state which mounted | wore the ultrasonic actuator to the fixed frame of the lens barrel apparatus of FIG. It is a perspective view which shows the state which inserted the moving frame in the fixed frame of the ultrasonic actuator mounting state of the lens barrel apparatus of FIG. It is a perspective view which shows the state which inserted the drive roller in the driven frame of the lens barrel apparatus of FIG. It is a perspective view (a part is shown by a cross section) of the lens barrel apparatus of FIG. 1, Comprising: The drive initial state is shown. It is a perspective view which shows the partial cross section of the lens barrel apparatus of FIG. 1, Comprising: The drive state by a moving frame is shown. It is a perspective view which shows the partial cross section of the lens barrel apparatus of FIG. 1, Comprising: The drive state by an outer frame is shown. FIG. 6 is a partial cross-sectional view of the lens barrel device of FIG. 1 and shows a state corresponding to FIG. 5. FIG. 7 is a partial cross-sectional view of the lens barrel device of FIG. 1 and shows a state corresponding to FIG. 6. FIG. 8 is a partial cross-sectional view of the lens barrel device of FIG. 1 and shows a state corresponding to FIG. 7. It is the figure which looked at the state which fixed the flexible printed circuit board to the vibrator | oscillator of the ultrasonic actuator applied to the lens barrel apparatus of FIG. 1 from the support-axis direction. It is A arrow directional view of FIG. It is the figure which looked at the state which removed the flexible printed circuit board from the vibrator | oscillator of FIG. 11 from the support-axis direction. It is a B arrow line view of FIG. It is C arrow directional view of FIG. FIG. 12 is an exploded perspective view of a piezoelectric element portion and an insulating plate constituting the vibrator of FIG. 11 before baking processing. It is the figure which expanded and showed the deformation | transformation state at the time of the synthetic | combination vibration of the bending vibration of the vibrator | oscillator of FIG. 11, and a longitudinal vibration, Comprising: A vibrator | oscillator is the expansion | extension state of FIG. 17 (B) from the bending state of FIG. FIG. 17C shows a state of deformation in the order of the bent state of FIG. 17C and the contracted state of FIG. FIG. 12 is a block configuration diagram of a drive control circuit for driving the vibrator of FIG. 11. It is a disassembled perspective view of the lens barrel device incorporating the lens barrel driving device according to the second embodiment of the present invention. It is a perspective view (a part is shown by a cross section) of the lens barrel apparatus of FIG. 19, Comprising: The drive initial state is shown. It is a perspective view which shows the partial cross section of the lens barrel apparatus of FIG. 19, Comprising: The drive state by a moving frame is shown. It is a perspective view which shows the partial cross section of the lens barrel apparatus of FIG. 19, Comprising: The drive state by an outer frame is shown. FIG. 20 is a partial cross-sectional view of the lens barrel device of FIG. 19 and shows a state corresponding to FIG. 20. It is a fragmentary sectional view of the lens barrel apparatus of FIG. 19, Comprising: The state corresponding to FIG. 21 is shown. FIG. 22 is a partial cross-sectional view of the lens barrel device of FIG. 19 and shows a state corresponding to FIG. 22.

Explanation of symbols

4 ... Moving frame (electric drive member, annular member)
5 ... Outer frame (manual drive member, annular member)
6 ... driven frame (driven member, drive conversion mechanism,
(Annular member)
6a ... Roller insertion hole (window)
6b ... Shaft support groove (support means)
7 Roller (rolling element, drive conversion mechanism)
10 ... Photography lens (moving lens)
11 ... Actuator mounting plate (biasing means)
35 ... vibrator 57 ... rotation operation frame (manual drive member, manual rotation operation member,
(Annular member)

Agent Patent Attorney Susumu Ito

Claims (9)

At least one vibrator that generates elliptical vibration by combining bending standing wave vibration and longitudinal vibration;
An electric drive member that receives the action of elliptical vibration of the vibrator and is driven to move straight along the optical axis direction relative to the vibrator;
A manual drive member provided so as to be movable along the optical axis direction according to a manual operation;
A rolling element is disposed in pressure contact with the outer surface of the electric drive member and the inner surface of the manual drive member, and is capable of rolling along the optical axis direction. The electric drive member and the manual drive A driven member that moves linearly along the optical axis direction together with the rolling element that moves while rotating in response to movement along the optical axis direction relative to the member;
A lens barrel driving device comprising: The lens barrel driving device according to claim 1, wherein the vibrator is provided so as to be in press contact with an inner surface of the electric driving member. 2. The lens barrel driving device according to claim 1, wherein the rolling element is arranged so that a rotation axis thereof is in a direction parallel to a plane perpendicular to the optical axis. Furthermore, a window portion formed through the inner and outer surfaces of the driven member so as to expose the rolling elements on the inner surface and the outer surface;
Support means for supporting the rolling element so as to be movable integrally with the driven member along the optical axis direction and rotatable relative to the driven member;
The lens barrel driving device according to claim 1, comprising: 2. The lens barrel driving device according to claim 1, wherein the vibrator is rotatably supported around an axis substantially perpendicular to the optical axis. 6. The lens barrel driving device according to claim 5, further comprising biasing means for pressing and biasing the vibrator in a direction substantially perpendicular to the optical axis so that the vibrator is always in contact with the electric drive member. . Further, a manually operated manual rotation operation member,
A drive conversion mechanism that converts the manual drive member so as to move straight along the optical axis direction in accordance with a rotation operation of the manual rotation operation member;
The lens barrel driving device according to claim 1, comprising: 2. The lens barrel driving device according to claim 1, wherein the movable lens is driven by a straight movement of the driven member to be driven. 2. The lens mirror according to claim 1, wherein the electric drive member, the manual drive member, and the driven member are annular members supported so as to be capable of only linear movement along the optical axis direction. Frame drive device.

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